Do you need to pay if your invited to a party

All depends, if its a friend party to bring something, maybe,

Unless you rent the entire place out for a private event,;I would say yes.

Yes unless the person throwing the party pre paid for guests

Based on the fact they got someone camped by the front door, I would assume they charge everyone who enters the building.

It will cost $10 and you get to play all the games you want.

I think you can only pay just $10 but, thanks anyways

I'm not sure but gunna guess yeah..